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Microchip Technology 1PMT5944C/TR7
- Part No.:
- 1PMT5944C/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5944C/TR7.pdf
- Description:
- DIODE ZENER 62V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,362
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Product details
Overview
1PMT5944C/TR7 from Microsemi is a 62 V, ±1% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 100 Ω dynamic impedance at 6.0 mA test current and thermal resistance of 30°C/W junction-to-tab - used for precision voltage regulation in space-constrained industrial power supplies.
For engineers reviewing the 1PMT5944C/TR7 datasheet, 1PMT5944C/TR7 pinout, 1PMT5944C/TR7 application, or 1PMT5944C/TR7 equivalent, key selection criteria include zener voltage tolerance (±1%), ESD rating (>16 kV HBM), reverse leakage (≤1 µA at 47.1 V), thermal resistance (30°C/W), and compatibility with EIA-481 tape-and-reel automated assembly.
Technical Context
This Zener diode operates as a two-terminal voltage reference device with cathode designated by TAB 1, requiring no external biasing circuitry. Its full metallic bottom and integral heat sink locking tab enable direct thermal conduction to PCB copper, supporting stable regulation under transient load conditions.
The device exhibits low reverse leakage (≤1 µA at VR = 47.1 V) and tight knee characteristics (IZK = 0.25 mA, ZZK = 1500 Ω), enabling reliable clamping and reference performance across -55°C to +150°C junction temperature range without derating below 60°C tab temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 62 V ±1% at IZT = 6.0 mA - enables precise overvoltage protection threshold setting in 48 V DC systems |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - supports continuous regulation in thermally constrained SMT layouts |
| Dynamic Impedance | 100 Ω at IZT - ensures minimal output voltage variation under ±10% current load changes |
| Reverse Leakage | ≤1 µA at VR = 47.1 V - maintains low standby power loss in always-on monitoring circuits |
| Thermal Resistance | 30°C/W junction-to-TAB1 - allows direct thermal path to PCB ground plane for stable long-term VZ drift |
| ESD Rating | >16 kV per HBM - eliminates need for external ESD protection in board-level handling and field deployment |
| Junction Temp Range | -55°C to +150°C - qualified for under-hood automotive and industrial motor control environments |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral heat sink locking tab; cathode identified by TAB 1; mounting position unrestricted; weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat sink interface and electrical cathode connection - must be soldered to thermal pad for rated 3.0 W operation |
| Lead 2 | Anode | Standard anode terminal - routed to system ground or return path in shunt regulator configuration |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables high-density PCB layout while delivering 3.0 W power handling comparable to through-hole DO-41 devices |
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term solder joint reliability and thermal transfer |
| Integral heat sink locking tab | Provides mechanical anchoring and direct thermal conduction path from junction to PCB copper, reducing θJA by >40% |
| ESD robustness | >16 kV HBM rating allows direct integration into unshielded I/O and sensor interface circuits without added protection components |
Applications
| Industrial Power Supply Regulation | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Shunt regulation in 48 V intermediate bus converters where space limits use of larger packages. IC Role / Device Role / Timing Role: Zener diode providing precise 62 V overvoltage clamp to protect downstream DC-DC controllers. Use Value: ±1% VZ tolerance ensures clamp activation within 0.62 V margin; 30°C/W thermal resistance sustains regulation stability during 85°C ambient operation. | Use Scenario: Transient voltage suppression on 12 V/24 V CAN bus power rails exposed to load dump events. IC Role / Device Role / Timing Role: Primary clamping element absorbing ISO 7637-2 Pulse 5a energy via controlled avalanche breakdown. Use Value: 3.0 W rating handles 100 ms load dump surges; >16 kV HBM withstands ESD events during connector mating/unmating. |
| Test Equipment Reference Source | LED Driver Overvoltage Protection |
Use Scenario: Precision voltage reference in portable multimeter front-end analog signal conditioning. IC Role / Device Role / Timing Role: Stable 62 V reference for ADC input scaling and calibration offset correction. Use Value: Low 1 µA IR at 47.1 V minimizes reference current error; ±1% tolerance reduces factory calibration burden. | Use Scenario: Overvoltage protection for constant-current LED drivers in streetlight control modules. IC Role / Device Role / Timing Role: Fail-safe shunt clamp preventing driver IC destruction during open-circuit LED string faults. Use Value: Integral heat sink tab transfers fault energy directly to heatsink PCB layer; 1500 Ω knee impedance ensures soft turn-on during overvoltage transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF62A (ON Semiconductor) | 62 V, ±5%, 1.0 W, SOD-123FL package, θJA = 190°C/W | Lower power rating and higher thermal resistance limit use to <1 W continuous clamping | Select when board space is critical but power stress is low; requires additional thermal relief for >500 mW operation |
| BZX84-C62 (Diodes Inc.) | 62 V, ±5%, 300 mW, SOT-23 package, θJA = 270°C/W | Not suitable for 3.0 W dissipation; intended for signal-level voltage referencing only | Use only for low-power biasing or logic-level clamping; not a functional replacement for 1PMT5944C/TR7's power-handling role |
Compared with SMF62A and BZX84-C62, the 1PMT5944C/TR7 delivers 3× higher power capability and 6× lower thermal resistance, making it uniquely suited for industrial and automotive applications demanding sustained 3.0 W regulation or clamping without external heatsinking.
Availability
1PMT5944C/TR7 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU protection, test equipment reference design, and LED driver overvoltage protection requiring stable component supply and traceable sourcing.
Supply support for 1PMT5944C/TR7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The Powermite® Zener diode product line was designed specifically for surface-mount power regulation and transient suppression in thermally demanding environments where traditional leaded packages cannot meet size or thermal goals.
FAQ
What is the zener voltage tolerance for 1PMT5944C/TR7?
The "C" suffix in 1PMT5944C/TR7 denotes ±1% zener voltage tolerance at IZT = 6.0 mA and TAB 1 temperature of 30°C. This tighter tolerance enables accurate overvoltage thresholds in safety-critical regulation circuits where standard ±5% parts would introduce unacceptable margin uncertainty. The 1PMT5944C/TR7 achieves this via laser-trimmed silicon and process-controlled doping.
How is thermal performance specified for 1PMT5944C/TR7?
1PMT5944C/TR7 specifies thermal resistance as 30°C/W junction-to-TAB1, measured with TAB 1 held at 60°C. This value reflects direct conduction through the full metallic bottom and locking tab into PCB copper. Unlike standard SMT diodes, its thermal path bypasses epoxy mold compound, enabling full 3.0 W dissipation without external heatsinks when mounted per Microsemi's recommended pad layout.
Does 1PMT5944C/TR7 require special PCB layout considerations?
Yes - 1PMT5944C/TR7 requires a minimum 10 mm² copper thermal pad connected to TAB 1 with ≥4 thermal vias (0.3 mm diameter) to an internal ground plane. The datasheet specifies mounting pad dimensions per DO-216 outline and warns against floating TAB 1, which de-rates power to <0.5 W. Proper layout ensures the rated 30°C/W thermal resistance and stable 62 V regulation under load.
What does the "TR7" suffix indicate in 1PMT5944C/TR7?
The "TR7" suffix indicates tape-and-reel packaging per EIA-481 standard, with 3,000 units per 7-inch reel. This format is optimized for high-speed pick-and-place assembly and ensures consistent orientation (cathode TAB 1 leading) and moisture sensitivity level (MSL) compliance. TR7 reels are compatible with standard SMT feeders and support JIT manufacturing without manual handling.
Can 1PMT5944C/TR7 replace older through-hole Zener diodes like 1N5388B?
Yes - 1PMT5944C/TR7 is a direct functional replacement for 1N5388B (62 V, 5 W, DO-41) in applications where 3.0 W suffices and board space is constrained. While rated for 2 W less, its 30°C/W thermal resistance and metallic bottom deliver superior steady-state regulation stability. Layout change is required: DO-41 footprint must be replaced with Powermite® pad pattern, and TAB 1 must connect to thermal copper.
1PMT5944C/TR7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-216AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 62 V
- Tolerance:
- ±2%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 47.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-216AA
1PMT5944C/TR7 FAQ
1.How can I place an order for 1PMT5944C/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5944C/TR7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1PMT5944C/TR7 reliable?
The price and inventory of 1PMT5944C/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5944C/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5944C/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5944C/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5944C/TR7?
1PMT5944C/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5944C/TR7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1PMT5944C/TR7?
For technical support, including 1PMT5944C/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5944C/TR7 requirements.
6.How does Aetrix verify that 1PMT5944C/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5944C/TR7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1PMT5944C/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5944C/TR7?
All 1PMT5944C/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5944C/TR7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1PMT5944C/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5944C/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5944C/TR7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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